/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package java.util.function;

import java.util.Objects;

@FunctionalInterface
public interface Predicate<T> {
	boolean test(T t);

	default Predicate<T> and(Predicate<? super T> that) {
		return (t) -> test(t) && that.test(t);
	}

	default Predicate<T> negate() {
		return (t) -> !test(t);
	}

	default Predicate<T> or(Predicate<? super T> that) {
		return (t) -> test(t) || that.test(t);
	}

	static <T> Predicate<T> isEqual(Object targetRef) {
		return (targetRef != null) ? object -> targetRef.equals(object) : Objects::isNull;
	}
}
